Muscles : axial musculature Muse 2430 sp Lecture #11 6/21/10
Introduction The axial musculature arises on the axial skeleton. Positions the head and vertebral column Moves the rib cage Axial muscles do not play a role in the movement or stabilization of the pectoral or pelvic girdles or the limbs. Roughly 60 percent of the skeletal muscles in the body are axial muscles. Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature The axial muscles fall into four logical groups based on location and/or function. Muscles of the head and neck Facial expression Whistling Sucking Chewing Swallowing Contractions of the eye muscles Muscles of the vertebral column Oblique and rectus muscles Diaphragm Muscles of the pelvic floor Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.1 Superficial Skeletal Muscles, Anterior View Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.1 Superficial Skeletal Muscles, Anterior View Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.2 Superficial Skeletal Muscles, Posterior View Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.2 Superficial Skeletal Muscles, Posterior View Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Muscles of the Head and Neck Can be subdivided into several groups: Muscles of facial expression Extraocular muscles Muscles of mastication Muscles of the tongue Muscles of the pharynx Anterior muscles of the neck Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.3 Muscles of the Head and Neck, Part I Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.3 Muscles of the Head and Neck, Part I Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.4 Muscles of the Head and Neck, Part II Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.4 Muscles of the Head and Neck, Part II Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.4 Muscles of the Head and Neck, Part II Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.5 Extraocular Muscles (Lateral Surface of Right Eye) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.5 Extra-ocular Muscles (Medial Surface of Right Eye) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.5 Extra-ocular Muscles (Anterior View of Right Eye) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.5 Extraocular Muscles (Anterior View of Right Orbit) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.6 Muscles of Mastication (Lateral View) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.6 Muscles of Mastication (Lateral View, Pterygoid Muscles Exposed) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.7 The Sphenomandibularis Muscle Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.8 Muscles of the Tongue Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.9 Muscles of the Pharynx (Lateral View) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.9 Muscles of the Pharynx (Midsagittal View) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.10 Anterior Muscles of the Neck, Part I (Anterior View) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.10 Anterior Muscles of the Neck, Part I (Superior View) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.11 Anterior Muscles of the Neck, Part II Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Muscles of the Vertebral Column Back muscles form three distinct layers: Superficial—move the neck Intermediate—extend the vertebral column Deep—interconnect vertebrae Extrinsic muscles—those in the superficial and intermediate layers Intrinsic (or true) muscles—those in the deepest layer; in turn, these intrinsic muscles are arranged in superficial, intermediate, and deep layers Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.12 Muscles of the Vertebral Column, Posterior View of Superficial (Right) and Deeper (Left) Muscles Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.12 Muscles of the Vertebral Column Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.12 Muscles of the Vertebral Column Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Oblique and Rectus Muscles The muscles of the oblique and rectus groups lie between the vertebral column and the ventral midline. The oblique muscles can compress underlying structures or rotate the vertebral column, depending on whether one or both sides are contracting. The rectus muscles are important flexors of the vertebral column, acting in opposition to the erector spinae. Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.13 The Oblique and Rectus Muscles Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.13 The Oblique and Rectus Muscles Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.14 The Diaphragm Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.14 The Diaphragm Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.14 The Diaphragm Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.15 An Inguinal Hernia Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Muscles of the Perineum and the Pelvic Diaphragm Three main functions: Support the organs of the pelvic cavity Flex the joints of the sacrum and coccyx Control the movement of materials through the urethra and anus Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.16 Muscles of the Pelvic Floor (Female) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Figure 10.16 Muscles of the Pelvic Floor (Male) Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
The Axial Musculature Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings